Improvement in sawing-machines



A. T. NICHOLS. SawngMaching.

.g`I-I Patented Aug.17,1875.

.. annum ,I

UNITED STATES ALBERT T. NICHOLS, OF WILLIAMSPORT, PENNSYLVANIA.

IMPROVEMENT IN SAWlNG-MACHINES.

Specification forming part of Letters Patent No. 166,887, dated August17, 1875; application filed June 8, 1875.

To all whom it may concern:

Be it known that I, ALBERT T. NICHOLS, of Williamsport, in the county ofLycoming and inthe State ofPennsylvania, have invented certain new anduseful Improvementsin Sawin g- Machines; and do hereby declare that thefollowing is a full, clear, and exact description thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, making a part of this specification.

The nature of my invention consists in the construction and arrangementofa belt-strainer or self-tightener for that class of sawing-machines inwhich the saw-arbor is mounted upon a movable carriage or a stationaryarbor, but more particularly for the movable carriage, as will behereinafter more fully set forth.

In order to enable others skilled in the art to which my inventionappertains to make and use the same, I will now proceed to describe itsconstruction and operation, referring to the annexeddrawing, whichrepresentsa perspective view of a sawing-machine embodying my invention.

A represents the circular saw mounted upon the arbor a., which has itsbearings in a carriage, B, movable back and forth upon slides b b. Thecarriage B is moved by means of a lever, O, connected with the carriageby a rod, d, as shown. f is the driving shaft, having its bearings inthe frame of the Inachine, or they may be placed on or under the door,and receiving its motion from the engine by a belt in any suitablemanner.

On the shaftis a pulley, D, secured thereto,

and on each side of this pulley is an arm, E, placed loosely on theshaft. The outer ends ofthe two arms are rigidly connected together, andtwo pulleys, h h, are arranged between said arms, with their journalbearings in them near the outer ends.

G represents an'endless belt passing around the pulley D, then under thetwo pulleys h h, and up around a pulley, t, 011 the saw-arbor a.

It will readily be seen that the weight of the pulleys h h and arms E Ealways keeps the belt at the proper tension to rotate the saw, and thebelt-strainer thus constructed adjusts itself to correspond with themovement ofthe saw-carriage.

This device is simple, cheap, and effective for the purpose for which itis intended, and it is not liable to get out of order. If necessary,weights may be placed on the outer ends of the arms E.

Having thus fully described my invention, what I claim as new, anddesire to secure-by Letters Patent, is

The arms E E, hinged to the shaftf, free at their outer ends, and havingpulleys h h, and acting as a guide and a tightener for the belt G, incombination with the device for moving the saw frame, substantially asherein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this28th day of May, 1875.

ALBERT T. NICHOLS.

Witnesses C. L. EvERT, A. N. MARR.

